div{
    height: 800px;
    width: 500px;
    border: 1px solid;
    margin: 100px;
    padding: 100px;
}
#title{
    color: red;
    font-size: 30px;
    /*margin-left: 100px;*/
    text-align: center;

}
.link1{
    text-decoration: none;
    color: black;

}
a:link {color:#000000;}      /* 未访问链接*/
a:visited {color:#00FF00;}  /* 已访问链接 */
a:hover {color:#FF00FF;}  /* 鼠标移动到链接上 */
a:active {color:#0000FF;}  /* 鼠标点击时 */
